ST STM32F101xx User Manual

RM0008 Secure digital input/output interface (SDIO)
Doc ID 13902 Rev 12 589/1096
22.9.9 SDIO data control register (SDIO_DCTRL)
Address offset: 0x2C
Reset value: 0x0000 0000
The SDIO_DCTRL register control the data path state machine (DPSM).
313029282726252423222120191817161514131211109876543210
Reserved
SDIOEN
RWMOD
RWSTOP
RWSTART
DBLOCKSIZE
DMAEN
DTMODE
DTDIR
DTEN
rw rw rw rw rw rw rw rw rw rw rw rw
Bits 31:12 Reserved, always read as 0.
Bit 11 SDIOEN: SD I/O enable functions
If this bit is set, the DPSM performs an SD I/O-card-specific operation.
Bit 10 RWMOD: Read wait mode
0: Read Wait control stopping SDIO_D2
1: Read Wait control using SDIO_CK
Bit 9 RWSTOP: Read wait stop
0: Read wait in progress if RWSTART bit is set
1: Enable for read wait stop if RWSTART bit is set
Bit 8 RWSTART: Read wait start
If this bit is set, read wait operation starts.
Bits 7:4 DBLOCKSIZE: Data block size
Define the data block length when the block data transfer mode is selected:
0000: (0 decimal) lock length = 2
0
= 1 byte
0001: (1 decimal) lock length = 2
1
= 2 bytes
0010: (2 decimal) lock length = 2
2
= 4 bytes
0011: (3 decimal) lock length = 2
3
= 8 bytes
0100: (4 decimal) lock length = 2
4
= 16 bytes
0101: (5 decimal) lock length = 2
5
= 32 bytes
0110: (6 decimal) lock length = 2
6
= 64 bytes
0111: (7 decimal) lock length = 2
7
= 128 bytes
1000: (8 decimal) lock length = 2
8
= 256 bytes
1001: (9 decimal) lock length = 2
9
= 512 bytes
1010: (10 decimal) lock length = 2
10
= 1024 bytes
1011: (11 decimal) lock length = 2
11
= 2048 bytes
1100: (12 decimal) lock length = 2
12
= 4096 bytes
1101: (13 decimal) lock length = 2
13
= 8192 bytes
1110: (14 decimal) lock length = 2
14
= 16384 bytes
1111: (15 decimal) reserved
Bit 3 DMAEN: DMA enable bit
0: DMA disabled.
1: DMA enabled.

ST STM32F101xx Specifications

General

Brand	ST
Model	STM32F101xx
Category	Microcontrollers
Language	English